Constant tesnion reeling mechanism



Jan. 10, 1967 J. IPPOLITO 3,297,273

CONSTANT TENSION REELING MECHANISM Filed June 18, 1965 5 Sheets-Sheet l I NVEN TOR.

James Ippolifo' "M 8. Mi

AT TO RNBY Jan. 10, 1967 J. IPPCDLITO 3,297,273

CONSTANT TENSION REELING MECHANISM Filed June 18, 1965 3 Sheets-Sheet 5 FIG.4

United States Patent 3,297,273 CONSTANT TENSION REELING MECHANISM James Ippolito, 1624 Stillwell Ave., Bronx, N .Y. 10461 Filed June 18, 1965, Ser. No. 464,905 11 Claims. (Cl. 24275.5)

This invention relates in general to a reeling and winding mechanism; and more specifically to a reeling mechanism for reeling spirally wound material from one spool onto another in a manner to prohibit overrunning and/ or breakage of the spirally wound material.

Heretofore in reeling devices for reeling spirally wound material from one spool to another, as for example in movie cameras, tape recording machines, and generally in all reeling machines of spirally wound material, it frequently happened that the rate at which the material is being fed out from one spool is not the same as the rate at which it is being pulled. When this occurs, the material frequently breaks, or it may overrun and then cause either a breakage of the material and/ or jamming of the reeling mechanism. In high speed reeling operations, as for example in high speed photographic cameras in which film may travel at a very high rate of speed, as for example 3,000 frames per second and faster, considerable difliculty has been encountered in starting and stopping such filming. This is because the film tend to jerk or overrun due to the inherent inertia of the respective spools and other rotating parts of the reeling mechanism in starting or stopping to result in breakage or jamming of the film.

It is, therefore, an object of this invention to provide a reeling mechanism for spirally wound material with an automatically operating control to maintain the spiral wound material taut regardless of the relative speeds or conditions imposed upon the respective take-up and supply reels of the mechanism.

Another object of this invention is to provide a reeling mechanism with a control that positively assures that the take-up reel and feed reel of the reeling mechanism are differentially and proportionally accelerated or decelerated so as to maintain a substantially constant tension on the material being reeled.

Another object is to provide a reeling mechanism for handling spirally wound material in which overrunning of the material upon starting and stopping is positively prohibited regardless of the conditions imposed upon the mechanism.

Another object is to provide a control that functions as a coupler for coupling the spindle of the feed reel in driving relationship to assist the material in driving the feed reel to maintain a substantially constant tension on the material.

Another object of this invention is to provide in a winding and reeling device of a variable braking means for the supply means which is self-actuating to maintain a substantially constant tension or tautness on the material being wound under all operating conditions of the mechanism.

The foregoing objects, and other features and advantages of this invention are attained by a winding and reeling mechanism comprising essentially of a take-up means including a spindle and take-up reel, a supply means including a spindle and supply reel, a differential means connecting the supply means and take-up means in driving relationship wherein the differential functions to distribute the torque between the respective take-up means and supply means as the material is unwinding from the reel of the supply means and winding upon the reel of the take-up means. In accordance with this invention, a control means is introduced on the supply means to automatically regulate the relative speeds of the respective spindle means to maintain a constant tension on the material. The control means is operatively associated between the differential 3,297,273 Patented Jan. 10, 1967 means and the supply means so as to permit the take-up means to attain its rated speed in the least possible time. To accomplish this, the control means includes a selfactivating brake means arranged to operate on the spindle of the supply means to prohibit either the turning thereof until the spirally wound material is sufficiently taut to effect the drive of the supply reel as the material is being unwound therefrom, or from overriding in the event the reel of the supply means is turning at a faster rate than the material is being wound upon the reel of the take-up means.

A feature of this invention resides in the provision that the control means functions to positively regulate the relative variable speed between the take-up means and the supply means so that an optimum balance is maintained therebetween under all operating conditions to insure that the rate at which the material being unwound is substantially equal to the rate at which the material is being wound,

Another feature of this invention resides in the provision of a control means incorporated on the supply side of the differential which functions to provide an appropriate braking action or drag on the supply means when unbalanced conditions are operating to insure that a substantially constant tension is maintained on the material being unwound from the supply means and reeled about the takeup means.

Another feature of this invention resides in a control means which is immediately responsive to the slightest variation or changes in conditions operating on the takeup means and the supply means so as to automatically effect the necessary relative adjustments between the rate at which the film is being unwound and the rate at which it is being wound whereby overriding or breakage of the material is prohibited during stoppage and starting of the system or during controlled speed runs.

Another feature of this invention resides in a braking means that is immediately responsive to the variable conditions operating on the take-up means and the supply means of a reeling mechanism during a winding and reeling operation so that substantially constant tension is maintained on the material being wound.

Other features and advantages will become more readily apparent when considered in view of the specification and drawings in which;

FlGURE 1 is a diagrammatic view of the reeling mechanism of this invention, having parts thereof shown in section.

FIGURE 2 is the detailed, sectional view of the supply means of the reeling mechanism of FIGURE 1.

FIGURE 3 is an enlarged fragmentary portion of the control means showing the cooperating relationship of the cam disc and the tensioning and braking disc.

FIGURE 4 is a top plan view of the tensioning and braking disc of the instant invention.

FIGURE 5 is a detail bottom view of the cam disc of the instant invention.

FIGURE 6 is an enlarged side elevation detail illustrating the relative variable positions between the cam disc and the cam rollers of the tensioning and braking disc.

Referring to the drawings, there is shown in FIG. 1 a reeling and winding mechanism 10 embodying the instant invention. Essentially the winding and reeling mecha nism 10 comprises a take-up means 12 including a take-up spindle 14 and a take-up reel or spool 16 mounted thereon, a supply means 18 including a supply spindle 20 and supply reel mounted thereon, a differential means 24 interconnecting the spindle 20 of the supply means 18 and the spindle 14 of the take-up means 12 in driving relationship. A variable speed motor means 25 which may be suitably controlled is operatively connected in driving relationship to the ditferential means 24 by means of a flexible belt 26, or by other suitable drive means, e.g. a gear train or the like. Accordingly, upon actuation of the motor means 25 the differential 24 is actuated to distribute the torque to respective take-up means 12 and supply means 18 so as to complement the relative velocities between the take-up spindle 14 and the supply spindle 29.

In winding and reel winding mechanism of the type with which this invention relates, a spool or reel 22 of spirally wound material is fixed to the supply spindle 29. A complementary take-up spool 16 is fixed to the take-up spindle 14. In reeling the material from one spool or reel to the other, with mechanisms of this type, the takeup reel 16 will pull or unwind the material from the supply reel, and cause the material to wind onto the takeup spool. Because the supply spool or reel has all or the greater amount of material thereon during the initial operation of the reeling mechanism, the take-up spindle and reel connected thereto will rotate at a faster rate than the supply spindle 20 and spool 22 thereon. The reason for this being that the take-up spindle 20 must make a greater number of revolutions than that of the supply spindle 14 in order to attain an optimum balance between the rate at which the material is being pulled from the supply reel and the rate at which the material is being wound on the take-up reel. As the reeling continues, the speed of the take-up spool 16 is gradually diminishing as the speed of the supply spool 20 is gradually increasing. Under normal operating conditions, the dilferential 24 is sufiicient to balance the relative speeds of the respective spindles 14 and 20. Thus, as long as the reeling operation is functioning in a normal continuous manner the differential 24 is suflicient to maintain a substantial constant tension on the material being wound. However, in the event that the reeling operation is required to be stopped or to maintain a constant linear velocity of the material being wound, the inertia of the supply reel 22 and/or of the other rotating parts of the mechanism is such that the material is likely to break or override to thereby cause either a breakage of jamming. In high speed reeling and winding operations, as for example in high speed photography, the difficulties or the problems of breaking and/or overriding has been a cause of considerable concern to those in the art during starting and stopping of such operations.

In according with this invention a means is provided to positively insure that the material being wound is maintained under a substantial constant tension throughout an entire winding and reeling operation regardless of the conditions imposed upon the take-up side or supply side of the reeling mechanism. Referring more specifically to FIGURE 2, the supply means 18 comprises a supply spindle 20 which is rotatably journaled by suitable bearing means 28, 30 within a housing 32. As shown, the upper end of the spindle 20 extends through an appropriate opening formed in the end of the housing. Secured to the upper end of the spindle is a spool or reel 22. The spool or reel is defined by a pair of opposed similar plate members 22A, 22B between which there is sandwiched the core 22C of the reel or spool 22. The arrangement is such that the core of the spool or reel is suitably keyed to the upper end of the spindle 20 and is maintained in place thereon by a spool hub nut 34. The spool hub nut 34 in turn is secured in place by a spindle nut 36 which is threaded to an externally threaded end portion of the spindle 20. Accordingly, the reel 22 is suitably secured to the supply spindle 20.

In accordance with this invention a control means 38 is arranged to operate on the supply means 18 to control the tension on the material during stopping and starting 8?) as to prohibit breaking or overriding of the material. In the illustrated embodiment, the control means 38 includes a camming means in the form of a hub 40 or sleeve mounted on the spindle 20 in relative rotating relationship thereto. Bearing 42 and 44 support the hub 40 for rotation relative to the spindle 20. Fixed to the hub or sleeve 40 is a bevel gear 46 which is adapted to be disposed into meshing relationship with a complementary bevel gear 48 which is secured to the end of the differential drive shaft 50. Accordingly, the side of the housing 32 is provided with an opening 32A through which the end of the differential drive shaft 50 projects to locate the bevel gear 48 on the end thereof in meshing relationship With the bevel gear 46 of the hub 40. A suitable bearing 52 maintains the drive shaft 50 in rotating relationship with respect to the housing 32. On the end of the hub 49 there is fixed a cam disc 54.

As best seen in FIGURES 1, 3, and 6 the cam disc 54 is provided with a pair of diametrically opposed cam dwell areas 56 defined by inclined surfaces 56A and 56B.

cooperatively associated with the cam disc 54 to form a cooperating element of the control means 38 is a braking means 58 that includes a tensioning and braking member or disc 60 which is keyed to the bottom of the supply spindle 20 to rotate therewith while at the same time mounted for axial movement along the spindle 20.

As best seen in FIGURES 3 and 4 the tensioning and braking member 60 is provided with opposed grooves or recesses 62 in which there is journaled about suitable dowel pins 64 a cam roller 66. In assembly the cam rollers 66 are arranged so as to be disposed within the cam dwells 56 of the cam disc 54. The arrangement is such that the rollers 66 of the tensioning and braking disc 69 are disposed in rolling contact with the inclined surfaces of the cam dwells in the cam disc.

Mounted on the bottom 68 of the housing is the pressure plate 70 having a friction shoe 72 disposed opposite to a complementary bearing surface of the tensioning and braking disc 60 to define the complementary braking element of the brake means 58.

In accordance with this invention, the friction shoe 72 of the brake element 70 may be adjusted to vary the spacing between brake member 60 and 72. This is readily attained by the plurality of adjusting studs 74 circumferentially spaced about the bottom wall of the housing. Preferably three such adjusting studs 0r screws 74 are circumferentially spaced about the bottom 68 of the housing 32. Accordingly, by rotating these studs 74 in one direction or the other, the adjustment of the friction shoe 72 may be attained.

If desired, the end of the adjusting stud may be protected by a hollow head nut 76 which closes or prevents accidental or unintentional movement of the respective adjusting studs.

With the description of the reeling mechanism thus set forth, the operation of the mechanism is as follows: In reeling spiral wound material, eg in high speed pho tography, it is essential that the film be fed out from the the supply reel 22 at substantially the same rate that it is pulled in by the take-up reel 16. Unless this is done, the film is subjected to break-age or overrunning which causes breakage or jamming. Accordingly, the differential 24 is arranged to transfer the torque from one spool to the other to complement the relative velocities therebetween so that one spool may progressively decrease as the other spool progressively increases as is necessary to maintain the film taut or under tension during a reeling operation. However, in the event that the film is required to be controlled as in starting and stopping or running at a constant speed, a control means 38 is interposed on the feed side 18 of the mechanism which will operate to insure that the rotational movement of supply spindle 20 will lag with respect to the rotational movement of takeup spindle 14 of proper amount to effect :a substantially constant tension on the material being wound, during acceleration and maintain said tension after rated speed has been attained. To accomplish this, upon starting the system, the control means 38 imposes a drag or braking action of sufficient magnitude on the supply spindle 20 to cause the above mentioned lag. With the structure described, the take-up spindle 14 and reel 16 connected thereto is permitted to accelerate ahead of the supply spindle 20, due to the fact that the inertia of the system is such that the hub 40 is the first element to rotate as it has the least inertia of all the elements connected in driving relationship with the differential 24. Accordingly, it is rotated an angular amount, and the cam disc 54 rotates therewith. In less than 2 of relative angular displacement, the camming dwells 56 riding over the cam rollers 66 will cause the braking element 60 to be axially moved toward the brake shoe 72 and thereby couple the hub 40 to the spindle 20 so that all the torque developed by the motor 25 and differential 24 is distributed to the take-up side 12 of the mechanism. Accordingly, the take-up side 12 is arranged to start acceleration first. Since the take-up side is connected to the supply side by the film itself, the supply spindle and spool does not rotate until pulled by the film itself. As the supply spindle 20 is rotated by the pull of the film the tension and brake element 60 with the cam rollers 66 will also rotate. In doing so, the roller 66 moving relative to cam dwell 56 to the center thereof will tend to release the brake means 58 so that the supply spindle 20 and reel 22 may follow the take-up spindle 14 and reel 16.

Thus acceleration of the supply spindle 20 and the braking disc 60 keyed thereto will cause the cam rollers 66 on acceleration to be shifted toward the dwell of the cam disc. In the event of too fast an acceleration, the rollers 66 will tend to ride to one side of the cam dwell. When this occurs the brake element is cammed toward the braking shoe to apply drag on the spindle 20. Accordingly, the torque is unbalanced to speed up the take-up spindle. Upon equalization, the tension on the film will cause the spindle 20 to follow normally thereby again releasing the drag on the spindle. Thus depending on whether the spindle 20 is accelerating or decelerating with respect to the take-up spindle 14, the relative movement between the cam disc 54 and the braking member 60 is such that. the brake means 58 is automatically applied or released to control the amount of drag on the spindle 20 depending on the conditions imposed on the mechanism. By so doing, the tension on the material is maintained substantially constant at all times.

The camming surfaces of the cam disc are designed so that relative movement of the brake disc 60 toward and away from the brake shoe 72 is applied and released within a relative angular rotation therebetween of approximately 2 degrees. Accordingly, in less than 2 of motion sufficient brake is applied to control the rotation of the reel. It will be noted that as the brake element 6t} approaches the brake shoe 72, it applies the necessary drag or braking action to the spindle 20. The difference in torque is then distributed by means of the differential to the take-up spool 14. A static braking action is attained because the supply spindle is not moving. Since the film is connected from the supply spool to the take-up spool or reel, the take-up spool as it turns will begin to pull on the feed spool causing the feed spindle to turn in the same direction that the gear 46 wants to turn. In doing so, it releases the brake an amount equal to the torque applied to the drive of this spool. Accordingly, the drag or force applied by the brake 58 is rendered proportionally to the torque required by the take-up spool and by the take-up shaft, as

the only thing that releases the brake or lessens the brake is the pull of the film.

With the construction described, it will be noted that the cam disc functions also as a coupler for connecting the supply spindle 20 in driving relationship to the drive shaft 50 of the differential 24 to assist the pull of the material in rotating the spindle 20 to maintain a substantially constant tension-on the material. Accordingly, the ratio of coupling effect and braking effect which the cam disc 54 influences on the spindle 20 is a function of the slope or shape of the oamming dwell 56. For example, the larger the included angle defined by the dwell 56 the greater becomes the braking component relative to the coupling component effected by relative movement between the cam disc 54 and the braking disc 60. Conversely, the smaller the inclined angle of the cam dwell 56, the coupling component exceeds the braking component. Accordingly, by carefully designing the camming dwells with predetermined slopes the control means may be designed to accommodate winding materials having different physical characteristics.

While the instant invention has been described with respect to a particular embodiment thereof, it will be appreciated and understood that variations and modifications thereof may be made without departing from the spirit or scope of this invention.

What is claimed is:

1. A winding and reeling mechanism for handling spirally wound material comprising:

(a) a take-up reel means,

(b) a supply reel means,

(0) a differential means interconnecting said supply reel means in driving relationship with said take-up reel means whereby said differential means distributes the driving torque between the take-up means and supply means to complement the relative velocities therebetween during a reeling operation,

(d) a drive means operatively connected to said differential means for driving the same,

(e) and a control means operating on said supply reel means for coupling of said supply reel means in driving relationship with said differential means to assist the pull of the material in rotating said supply reel means for maintaining the material being wound therebetween under constant tension during any relative speed condition therebetween to prohibit overrunning or breakage during starting and stoppage or speed controlling of the reel-ing mechanism.

2. A Winding and reeling mechanism for handling spirally wound material comprising a take-up reel means,

a supply reel means,

a differential means interconnecting said supply reel means in driving relationship with said take-up reel means whereby said difierentia'l means distributes the driving torque between the take-up means and supply means to complement the relative velocities therebetween during a reeling operation,

a drive means operatively connected to said differential means for driving the same,

and a control means operating on one of said reel means for maintaining the material being wound therebetween under constant tension during any relative speed condition therebetween to prohibit overrunning or breakage during starting and stoppage or speed controlling the reeling mechanism, said control means including:

(a) a hub mounted on said supply reel means for relative rotation thereto,

(b) means connecting said hub in driving relationship to the supply side of said diiferential,

(c) and means cooperatively associated between said hub and said take-up means to effect a control over the relative movement therebetween for controlling the distribution of torque between said take-up means and said supply means and the coupling and uncoupling of the supply means to said hub so that the tension of the material between said take-up means and supply means is maintained substantially constant.

3. In a winding and reeling mechanism for handling spirally wound material including, a take-up means, a supply means, a differential means interconnecting said supply means in driving relationship with said take-up means whereby said differential means distributes the lriving torque between the take-up means and supply neans to complement the relative velocities therebetween luring a reeling operation, and a drive means operatively :onnected to said differential means for driving the same, he improvement of (a) a control means operating on said supply reel means four coupling said supply reel means in driving relationship to said differential means to assist the pull of the material in rotating said supply reel means for maintaining the material being wound therebetween under constant tens-ion during any relative speed condition therebetween to prohibit overrunning or breakage during starting and stoppage or speed controlling of the reeling mechanism,

(b) said control means including a braking means operating on said supply means to maintain the relative speed between said supply means and take-up means so that a material being wound therebetween is under a substantially constant tension.

4. In a winding and reeling mechanism for spirally wound material having a take-up spindle and reel mounted thereon, a supply spindle and reel connected thereto, a differential interconnecting said take-up spindle and supply spindle to distribute the driving torque therebetween to control the relative speed thereof during a reeling operation, the improvement of (a) control means operatively associated with the sup ply spindle to prohibit overriding of the material during starting and stopping or speed controlling of the reeling operation,

(b) said control means being rendered responsive to the tension of the material being wound between said take-up reel and said supply reel whereby said material is maintained under constant tension during any relative speed condition between said reels and (c) a camming means mounted for relative rotation on the supply spindle, and

(d) a brake means operatively associated between said camming means and supply spindle to positively transmit the initial driving torque to the take-up spindle on starting of a winding operation.

5. A reeling mechanism for spirally Wound material comprising:

(a) a take-up spindle and reel mounted thereon,

(b) a supply spindle and reel mounted thereon,

(c) a differential interconnecting said take-up spindle and supply spindle in driving relationship whereby said 'difierential distributes the driving torque therebetween to regulate the relative speeds between said spindles during a reeling operation,

(d) a power means for driving said differential,

(e) a control means operating on said supply spindle for maintaining the material taut and under substantially constant tension under any relative speed condition imposed on said spindles,

(f) said control means including camming means connected on said supply spindle for relative rotation thereto,

(g) means connecting said camming means in driving relationship to the supply side of said differential,

(h) braking means operating on the spindle of said supply means,

(i) and means interposed between said braking means and said camming means to regulate the actuation of said braking means to control the relative speeds between said spindles to maintain a substantially constant tension on the material wound between said reels.

6. The invention as defined in claim wherein said braking means includes:

(a) a braking member mounted on said supply spindle to rotate therewith, but keyed for relative axial movement relative thereto,

(b) a complementary braking member fixed relative to said first mentioned braking member,

(c) and means interposed between said camming means and said first braking member to effect actuation and release of said braking means to control the relative speeds of said spindles, said braking means being activated when the relative angular velocities between said camming means and said supply spindle and brake member connected thereto vary by a preetermined amount.

7. In a winding and reeling mechanism for spirally Wound material having a take-up spindle and reel mounted thereon, a supply spindle and reel connected thereto, a differential means interconnecting said take-up spindle and supply spindle to distribute the driving torque therebetween to control the relative speed thereof during a reeling operation, the improvement of (a) control means operatively associated with the supply spindle, said control means being responsive to the tension on the material being wound between said take-up reel and said supply reel to maintain said tension substantially constant during any relative speed condition between said reels,

(b) said control means including a hub mounted on said supply spindle for relative rotation thereto,

(0) means connecting said hub in driving relationship to the supply side of said differential means,

(d) a camming means connected to said hub for movement therewith,

(e) a cooperating material tensioning and braking means keyed to said take-up spindle for axial movement therealong,

(f) a braking shoe fixed relative to said material ten sion and braking means,

(g) and means on said tensioning and braking means in cooperating camming relationship with said camming means to effect axial displacement of said material tension and braking means relative to said braking shoe to effect a coupling and uncoupling of said supply spindle for distributing the torque between said spindles to said hub and for maintaining a constant tension on said material.

8. The invention as defined in claim 7 and including means to adjust the position of said braking shoe relative to said tensioning and braking means to adjust the braking force therebetween.

9. A reeling mechanism material comprising:

(a) a take-up spindle and take-up reel mounted there- (b) a supply spindle and a supply reel mounted there- (c) a differential interconnecting said take-up spindle and supply spindle in driving relationship whereby said differential distributes the driving torque therebetween to regulate the relative speeds of said spindles during a reeling operation,

(d) a power means for driving said differential,

(e) a control means operating on said supply spindle for maintaining the material taut and under substantially constant tension during any relative speed condition between said spindles,

(f) said control means including a hub mounted on said supply spindle for relative rotation thereto,

g) means connecting said hub in driving relationship to the supply side of said differential,

(h) a cam disc having a camming dwell formed thereon, said cam disc being connected to said hub to rotate therewith,

(i) a material tensioning and braking disc keyed to said supply spindle, said tensioning and braking disc being keyed to said supply spindle for relative axial movement as it rotates therewith,

(j) a cam roller mounted on said tensioning and braking disc, I

(k) said cam roller being disposed in camming relationship to the cam dwell of said cam disc,

(1) and a brake shoe fixed relative to said tensioning for handling spirally wound and braking disc whereby relative angular displacement between said hub and said supply spindle effect axial displacement of said tensioning and braking disc toward and away from said brake shoe re- (e) a control means operating on said supply spindle said supply spindle for rotation therewith, said tensioning and braking shoe being mounted thereon for axial movement therealong,

(j) cam rollers mounted on said tension and braking sulting from the angular displacement between said shoe, camming dwell and roller for braking said supply (k) said cam rollers being respectively disposed in the spindle in response to the tension of the material camming dwells of said cam disc in camming relabeing wound. v tionship with the inclined surfaces thereof, 10. A reeling mechanism for spirally wound material (1) and a complementary brake shoe fixed relative to comprising; said tension and braking shoe whereby the relative (a) a take-up spindle and take-up reel mounted thereangular displacement between said cam disc and said on, tensioning and braking shoe fixed to said supply (b) a supply spindle and a supply reel mounted therespindle efiect axial displacement of said tension and o braking shoe relative to said complementary brake (c) a differential interconnecting said take-up spindle shoe for braking said supply spindle to said comand supply spindle in driving relationship whereby plemen-tary fixed braking shoe in accordance to the said ditferential distributes the driving torque thereten ion on the material being wound, between to regulate the relative speeds of said spinand means for adjusting the Position of the dles during a reeling operation, plementary brake shoe to vary the braking force (d) a power means for driving said difierential, erted betWeen said shoes.

11. The invention as defined in claim 10 wherein said latter means includes a plurality of adjusting screws for setting the fixed position of said complementary brake for maintaining the material taut and under substantially constant tension at any relative speed of said spindles, shoe. (f) said control means including a hub mounted on said supply spindle for relative rotation thereto, References Cited by the Exammel' (g) cooperating gears connecting said hub in driving UNITED STATES PATENTS relationship to the supply side of said diflerential 2 5 0 21,413 9/1950 Scheuermann et a1. 242-755 (11) a cam disc havin opposed carnnnng dwells formed 2,887,280 4/1959 Bowen 242 755 thereon, said cam disc being connected to said hub to rotate therewith and the respective camming dwells having complementary inclined camming surfaces, (i) a material tensioning and braking shoe keyed to FRANK J. COHEN, Primary Examiner.

N. L. MINTZ, Assistant Examiner. 

1. A WINDING AND REELING MECHANISM FOR HANDLING SPIRALLY WOUND MATERIAL COMPRISING: (A) A TAKE-UP REEL MEANS, (B) A SUPPLY REEL MEANS, (C) A DIFFERENTIAL MEANS INTERCONNECTING SAID SUPPLY REEL MEANS IN DRIVING RELATIONSHIP WITH SAID TAKE-UP REEL MEANS WHEREBY SAID DIFFERENTIAL MEANS DISTRIBUTES THE DRIVING TORQUE BETWEEN THE TAKE-UP MEANS AND SUPPLY MEANS TO COMPLEMENT THE RELATIVE VELOCITIES THEREBETWEEN DURING A REELING OPERATION, (D) A DRIVE MEANS OPERATIVELY CONNECTED TO SAID DIFFERENTIAL MEANS FOR DRIVING THE SAME, (E) AND A CONTROL MEANS OPERATING ON SAID SUPPLY REEL MEANS FOR COUPLING OF SAID SUPPLY REEL MEANS IN DRIVING RELATIONSHIP WITH SAID DIFFERENTIAL MEANS TO ASSIST THE PULL OF THE MATERIAL IN ROTATING SAID SUPPLY REEL MEANS FOR MAINTAINING THE MATERIAL BEING WOUND THEREBETWEEN UNDER CONSTANT TENSION DURING AN RELATIVE SPEED CONDITION THEREBETWEEN TO PROHIBIT OVERRUNNING OR BREAKAGE DURING STARTING AND STOPPAGE OR SPEED CONTROLLING OF THE REELING MECHANISM. 